<template>
<div>
  <!--面包屑导航-->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>
  <!--卡片视图区-->
  <el-card>
    <!--警告区域-->
    <el-alert title="注意: 只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false">
    </el-alert>

    <!--选择商品分类区-->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类: </span>
        <!--选择商品分类的联机选择框-->
        <el-cascader :options="cateList" :props="cateProps" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
      </el-col>
    </el-row>

    <!--tab 分页区-->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <!--添加动态参数的面板-->
      <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" size="mini" :disabled='isBtnDisabled' @click="addDialogVisible=true">添加参数</el-button>
        <!--动态参数表格-->
        <el-table :data='manyTableData'>
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--循环渲染 tag 标签-->
              <el-tag v-for='(item,i) in scope.row.attr_vals' :key="i" closable @close='handleClose(i,scope.row)'>
                {{item}}
              </el-tag>
              <!-- 输入框 和 按钮 的切换 -->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
              </el-input>
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index">#</el-table-column>
          <el-table-column label='参数名称' prop="attr_name"></el-table-column>
          <el-table-column label='操作'>
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <!--添加静态属性的面板-->
      <el-tab-pane label="静态属性" name="only">
        <el-button type="primary" size="mini" :disabled='isBtnDisabled' @click="addDialogVisible=true">添加属性</el-button>
        <!--静态属性表格-->
        <el-table :data='onlyTableData'>
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--循环渲染 tag 标签-->
              <el-tag v-for='(item,i) in scope.row.attr_vals' :key="i" closable @close='handleClose(i,scope.row)'>
                {{item}}
              </el-tag>
              <!-- 输入框 和 按钮 的切换 -->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
              </el-input>
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index">#</el-table-column>
          <el-table-column label='属性名称' prop="attr_name"></el-table-column>
          <el-table-column label='操作'>
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>

    </el-tabs>
  </el-card>
  <!--添加 参数对话框-->
  <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close='addDialogClosed'>
    <el-form :model="addForm" :rules="addFormRules" ref='addRormRef' label-width="80px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer">
      <el-button @click="addDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
  </el-dialog>
  <!--修改参数的对话框-->
  <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close='editDialogClosed'>
    <el-form :model="editForm" :rules="editFormRules" ref='editRormRef' label-width="80px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer">
      <el-button @click="editDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',

      },

      // tab 切页 被激活 页签名称
      activeName: 'many',
      // 这是动态参数 数据
      manyTableData: [],
      // 这是静态属性 数据
      onlyTableData: [],
      // 控制 添加 对话框 状态
      addDialogVisible: false,
      // 控制 编辑对话框 状态
      editDialogVisible: false,

      // 添加参数表单数据对象
      addForm: {
        attr_name: ''
      },
      // 编辑表单数据对象
      editForm: {

      },
      // 添加表单规则对象
      addFormRules: {
        attr_name: [{
          required: true,
          message: '不能为空',
          trigger: 'blur'
        }]
      },
      // 编辑表单规则对象
      editFormRules: {
        attr_name: [{
          required: true,
          message: '不能为空',
          trigger: 'blur'
        }]
      }

    }
  },
  created() {
    this.getCateList()
  },

  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const {
        data: res
      } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取数据失败')
      this.cateList = res.data
      // this.$message.success(res.meta.msg)
      // console.log(this.cateList)

    },

    // 获取参数的列表数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据 当前所选分类的id 和当前所处的面板, 获取对应的参数
      const {
        data: res
      } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })

      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')

      //
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data

      } else {
        this.onlyTableData = res.data
      }
    },

    //点击对话框确认按钮
    addParams() {
      this.$refs.addRormRef.validate(async value => {
        if (!value) return
        const {
          data: res
        } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,

        })

        if (res.meta.status !== 201) return this.$message.error('操作失败')

        this.getParamsData()
        this.addDialogVisible = false
        this.$message.success(res.meta.msg)
      })
    },
    // 点击编辑 对话框确认按钮
    editParams() {
      this.$refs.editRormRef.validate(async value => {
        if (!value) return
        const {
          data: res
        } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.editForm.attr_sel
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')

        this.getParamsData()
        this.editDialogVisible = false
        this.$message.success(res.meta.msg)
      })
    },

    // 点击删除 根据id 删除对应项
    async removeParams(id) {
      try {
        await this.$confirm(`此操作将永久删除该${this.titleText}, 是否继续?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        })

        const {
          data: res
        } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)

        if (res.meta.status !== 200) this.$message.error('操作失败')
        this.getParamsData()
        this.$message.success(res.meta.msg)

      } catch (err) {
        this.$message.info('取消操作')
      }
    },
    // 点击编辑按钮 展示修改对话框
    async showEditDialog(id) {
      const {
        data: res
      } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: {
          attr_sel: this.activeName
        }
      })

      if (res.meta.status !== 200) return $message.error('获取参数失败')
      this.editForm = res.data
      // console.log(this.editForm)
      this.editDialogVisible = true

    },
    // 文本框失去焦点,或摁下 回车 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有 return 则证明输入了内容, 需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求 保存数据
      this.saveAttrValue(row)
    },

    // 将对 attr_vals 的操作 保存到数据库
    async saveAttrValue(row) {
      const {
        data: res
      } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('操作失败')
      this.$message.success('修改参数项成功')
    },
    // 点击按钮,展示文本框输入
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用, 就是当页面上元素被重新渲染之后, 才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的标签 和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValue(row)
    },
    // 级联选择框变化 
    handleChange() {
      this.getParamsData()
    },

    // tab 页签 点击事件的处理函数
    handleTabClick() {
      this.getParamsData()

    },
    // 监听对话框 关闭
    addDialogClosed() {
      this.$refs.addRormRef.resetFields()
    },
    // 监听对话框 关闭
    editDialogClosed() {
      this.$refs.editRormRef.resetFields()
    }

  },
  computed: {
    // 如果按钮需要被禁用, 则返回true 否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },

    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin-top: 15px;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>
